SMOOTH AND PROFILED METERING RODS
Metering rods are precision tools with special requirements on reproducibility. The production tolerances are within the µm range. During production, any deviation in diameter, smooth run, coating, etc. results in fluctuations in quantity and?/?or quality of the coating. In practice, more than 50 different standard profiles (fine to coarse) are in use, thus allowing metering of virtually all possible coating volumes.
Importance of metering rod precision for coating volume
A deviation of only 1 µm in the depth of the profile, for instance, can lead to approx. 5% change in index or coating volume.